import random
import time
import copy
import io, sys
import re
from decimal import *

n = int(input())
v = int(1e10)
res = Decimal("0.0")
for i in range(n):
    res += Decimal(input())
print(res)
res = int(res * v)
v2 = abs(res) % v
print(str(res // v) + '.' + "%010d" % v2)